Variables: What are they? In the case of engineering, variables are a condition or value that can change. Sometimes we control a variable, sometimes we don’t. In this episode of Crash Course Kids, Sabrina chats to us about how variables affect our choices as engineers.

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3-5-ETS1-3. Plan and carry out fair tests in which variables are controlled and failure points are considered to identify aspects of a model or prototype that can be improved.